The Biggest Loser Season 5 Episode 13 Competition Heats Up With Only Six Contestants Left ( Air Date 2008-03-25 ) Genre Reality category. Overview "Only six players are left, and the remaining women try to hold their own against the men who are still in the game. In a surprising pop quiz, one player wins a mysterious prize. And at this week's challenge, the players get the chance to sabotage one another by giving each other calories.".